Hmmm... it seems that "noise reduction threshold (nrt)" is a bit too *aggressive*. As soon as I set it to a value >0 almost any (next) frame is copied (reducing 24 fps content to 12 fps). I could send you a small sample clip of my source, but since it happens in any scene, I don't think this is necessary. "maximum frame shifting" works quite well :) and already helped me a lot. Thx